Spectrum Analyzer Basics

Download the Preselection Architectures in Signal Analyzers Application Note

Signal analyzers use front-end preselection to prevent unwanted image and mixer responses from interfering with microwave and millimeter-wave measurements. This application note compares YIG-tuned filters and switched filter banks, explains why they handle spurious responses differently, and outlines the trade-offs engineers should consider when selecting a preselection architecture.

  • Understand why signal analyzers require RF preselection
  • Compare YIG-tuned filters and switched filter banks
  • See why wideband filter banks suppress first-order images but not the (2,2) spur
  • Review trade-offs in speed, bandwidth, rejection, accuracy, and hardware complexity
  • Select an architecture for wideband analysis, fast sweeps, or narrowband spur measurements

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